package com.aganmall.common;

import org.codehaus.jackson.annotate.JsonIgnore;
import org.codehaus.jackson.map.annotate.JsonSerialize;

import java.io.Serializable;


/**
 * Created by GJY on 17/5/13.
 */
//响应对象有三个属性:status,msg,data<T>
//该范型的好处是在返回类型时可以指定返回类型或不指定
//例如:正确时返回String,错误返回map,但是封装时只能返回一个,因此采用范型
@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
//保证序列化json的时候,如果是null的对象,key也会消失
//用来去除null,例如(status,null,null)传入(int status)时会去除null
public class ServerResponse<T> implements Serializable {

    private int status;
    private String msg;
    private T data;

    //构造4个私有构造器,特别当参数传入(int,String)时会进入4构造方法,而不是2构造方法
    private ServerResponse(int status){
        this.status = status;
    }
    private ServerResponse(int status, T data){
        this.status = status;
        this.data = data;
    }
    private ServerResponse(int status,String msg, T data){
        this.status = status;
        this.msg = msg;
        this.data = data;
    }
    private ServerResponse(int status, String msg){
        this.status = status;
        this.msg = msg;
    }

    //用响应码枚举类来判断是否成功
    @JsonIgnore
    //使之不在jason序列化结果当中
    public boolean isSuccess(){
        return this.status == ResponseCode.SUCCESS.getCode();
    }

    public int getStatus(){
        return status;
    }
    public String getMsg(){
        return msg;
    }
    public T getData(){
        return data;
    }

    //public static success创建方法
    public static <T> ServerResponse<T> createBySuccess(){
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode());
    }
    public static <T> ServerResponse<T> createBySuccessMessages(String msg){
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg);
    }
    public static <T> ServerResponse<T> createBySuccess(T data){
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),data);
    }
    public static <T> ServerResponse<T> createBySuccess(String msg, T data){
        return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg,data);
    }

    //public static error创建方法
    public static <T> ServerResponse<T> createByError(){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(), ResponseCode.ERROR.getDesc());
    }

    public static <T> ServerResponse<T> createByErrorMessage(String errorMessage){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(),errorMessage);
    }

    public static <T> ServerResponse<T> createByErrorCodeMessage(int errorCode, String errorMessage){
        return new ServerResponse<T>(errorCode,errorMessage);
    }
}
